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Make your own Java Media Player to play media files |
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This Java Swing tip illustrates a method of programming your own Java Media
Player to play media files. A Java Media Framework player fundamentally is
an encapsulation of the multimedia component that allows for control of state
transitions during playback. JMF players provide methods to query the current
state, to acquire necessary resources, and to start, stop, and control the
actual playback of the media file or stream.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.media.*;
public class MediaPlayerDemo extends JFrame {
private Player player;
private File file;
public MediaPlayerDemo()
{
super( "Demonstrating the Java Media Player" );
JButton openFile = new JButton( "Open file to play" );
openFile.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
{
openFile();
createPlayer();
}
}
);
getContentPane().add( openFile, BorderLayout.NORTH );
setSize( 300, 300 );
show();
}
private void openFile()
{
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(
JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog( this );
// user clicked Cancel button on dialog
if ( result == JFileChooser.CANCEL_OPTION )
file = null;
else
file = fileChooser.getSelectedFile();
}
private void createPlayer()
{
if ( file == null )
return;
removePreviousPlayer();
try {
// create a new player and add listener
player = Manager.createPlayer( file.toURL() );
player.addControllerListener( new EventHandler() );
player.start(); // start player
}
catch ( Exception e ){
JOptionPane.showMessageDialog( this,
"Invalid file or location", "Error loading file",
JOptionPane.ERROR_MESSAGE );
}
}
private void removePreviousPlayer()
{
if ( player == null )
return;
player.close();
Component visual = player.getVisualComponent();
Component control = player.getControlPanelComponent();
Container c = getContentPane();
if ( visual != null )
c.remove( visual );
if ( control != null )
c.remove( control );
}
public static void main(String args[])
{
MediaPlayerDemo app = new MediaPlayerDemo();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{
System.exit(0);
}
}
);
}
// inner class to handler events from media player
private class EventHandler implements ControllerListener {
public void controllerUpdate( ControllerEvent e ) {
if ( e instanceof RealizeCompleteEvent ) {
Container c = getContentPane();
// load Visual and Control components if they exist
Component visualComponent =
player.getVisualComponent();
if ( visualComponent != null )
c.add( visualComponent, BorderLayout.CENTER );
Component controlsComponent =
player.getControlPanelComponent();
if ( controlsComponent != null )
c.add( controlsComponent, BorderLayout.SOUTH );
c.doLayout();
}
}
}
}
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